Polymer-containing pre-rinse prior to a conversion treatment
AssigneeHenkel AG & Co. KGaA
InventorsSophie Cornen, Kristof Wapner, Ralf Posner, Natascha Henze, Kirsten Agnes Lill, Michiel Gerard Maas
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Abstract
A multi-step method for anti-corrosion pretreatment of components made from metallic materials, in which a wet chemical treatment with an aqueous composition (A) containing a dissolved and/or dispersed polymer P, which is substituted with heterocycles containing at least one quaternary nitrogen heteroatom, is followed by a conversion treatment based on water-soluble compounds of the elements Zr, Ti, and/or Si before further anti-corrosion coatings are optionally applied.
Claims20
A multi-step method for anti-corrosion pretreatment of components made at least in part from metallic materials, comprising steps of:
- i) initially contacting at least a portion of surfaces of the components made at least in part from metallic materials with an aqueous composition (A) containing a dissolved and/or dispersed organic polymer P, of which a weight proportion of at least 40%, based on the total proportion of said organic polymer P is made up of repeating units RN which comprise as a substituent a heterocycle containing at least one quaternary nitrogen heteroatom;
- and subsequent to step i), with or without a rinsing and/or drying step therebetween;
- ii) bringing at least the portion of the surfaces of the components made at least in part from metallic materials into contact with an acidic aqueous composition (B) containing one or more water-soluble compounds of the elements Zr, Ti, and/or Si.
Dependencies are inferred from the claim text.